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A NEW 4G ARCHITECTURE PROVIDING MULTIMODE TERMINALS ALWAYS BEST CONNECTED SERVICES

A NEW 4G ARCHITECTURE PROVIDING MULTIMODE TERMINALS ALWAYS BEST CONNECTED SERVICES. CHEN YIPING AND YANG YUHANG SHANGHAI JIAO TONG UNIVERSITY 報告 : 謝旻欣. Outline. 一、 INTRODUCTION 二、 A 4G MOBILE SYSTEM 三、 ACCESS DISCOVERY 四、 PERSONALIZATION IN ACCESS NETWORK SELECTION

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A NEW 4G ARCHITECTURE PROVIDING MULTIMODE TERMINALS ALWAYS BEST CONNECTED SERVICES

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  1. A NEW 4G ARCHITECTURE PROVIDING MULTIMODETERMINALS ALWAYS BEST CONNECTED SERVICES CHEN YIPING AND YANG YUHANG SHANGHAI JIAO TONG UNIVERSITY 報告:謝旻欣

  2. Outline • 一、 INTRODUCTION • 二、 A 4G MOBILE SYSTEM • 三、 ACCESS DISCOVERY • 四、 PERSONALIZATION IN ACCESS NETWORK SELECTION • 五、 SEAMLESS HANDOVER WITH QOS SUPPORT • 六、 CONCLUSION

  3. 一、 Introduction(1/4) • In recent years, wireless communication technology has undergone a tremendous change. • Various radio access technologies (RAT) have been deployed all over the world. • However, the available radio resources of a single radio access network (RAN) are still far from satisfying the requirements of increasingly mobile services.

  4. 一、 Introduction(2/4) • Therefore, the 4G mobile system is proposed to integrate these multiple RAT in a common network that can ease the shortage of radio resources facing users today. • That is, one that provides always best connected (ABC) services to users. • ABC service means users can choose the best available access networks in a way that best suits their needs, and to change, if conditions change.

  5. 一、 Introduction(3/4) • There are a growing number of research efforts concerning ABC service. • However, there are still limitations in the ongoing research. • First, there is not an efficient way to collect the necessary data required for network selection. • Second, it is difficult to provide personalized best access selection for every user. • Third, it is hard to ensure quality of service (QoS) during handover from one access network to another.

  6. 一、 Introduction(4/4) • To solve the previously mentioned problems, a new 4G architecture is proposed in this study. • The architecture has the following features: • It proposes a new access discovery mechanism that integrates service location protocol (SLP) and location service (LCS). • It provides personalized ABC services through users changing weight factors in access network selection. • Seamless handover mechanism based on Mobile IPv6 is proposed. The mechanism supports end to-end quality of service.

  7. 二、 A 4G MOBILE SYSTEM(1/5) • The 4G architecture proposed in this study is Mobile IPv6-based and supports ABC services. • The architecture was based on the followingassumptions: • There is at least one wireless area network (WAN) that provides location-based service (LBS) EX：3G、CDMA2000 、GSM • All the RAN in the architecture are connected to the Internet. • All the terminals are multi-interface supported. Therefore, they can switch from one access network to another successfully. • Mobile IPv6 is supported in all of the RAN and the Internet.

  8. 二、 A 4G MOBILE SYSTEM(2/5) • The proposed architecture has three parts: • Service location protocol (SLP) architecture： • Directory agents (DA) ：radio access directory agent (RADA) • Service agent (SA) ：network managers of RAN • Client agent (CA) ：ABC agent • Location service (LCS) architecture： • ABC agent • LCS • Mobile IPv6 architecture： • correspondent node (CN) • user equipment (UE)

  9. 二、 A 4G MOBILE SYSTEM(3/5) • To summarize, the key entities in this network architecture are: • RADA: All the current QoS information of the RAN in the architecture is stored and updated in RADA. • ABC agent: When the UE sends an access discovery request, the ABC agent obtains position information from the LCS server and performs access discovery according to the UE position to obtain QoS information about all of the available RAN. • Network manager: This collects current QoS information in the RAN and updates it in the RADA.

  10. 二、 A 4G MOBILE SYSTEM(4/5) • Guidance network: This is a WAN-supported LCS, it provides the ABC agent with the location information of the UE. • UE: This is equipped with a multi-radio system.It selects the best network according to the QoS information available from an ABC agent.

  11. 二、 A 4G MOBILE SYSTEM(5/5) • The network manager in each RAN domain collects its own QoS information and registers to it the RADA. • The ABC agent obtains position information from the LCS Server and queries QoS information of the available RAN from the RADA and sends it to the UE. • After network selection, the network manager in the selected RAN allocates radio resources to the UE. • The UE changes its care-of-address (CoA) through the Mobile IPV6 mechanism.

  12. 三、 ACCESS DISCOVERY(1/7) • The process to collect QoS information of the available RAN is called access discovery. • So far, mobile terminals collect information of the available RAN mainly by means of measurements at their physical interfaces. This method is well-suited for single mode terminals. However, this method causes problems when the number of available RAN is more than one.

  13. 三、 ACCESS DISCOVERY(2/7) • First, information acquired this way is often not sufficient to make ABC decisions. • Second, it results in great waste in power consumption. • Third, it can lead to missing the collecting of information of some of the available RAN when a mobile terminal is busy.

  14. 三、 ACCESS DISCOVERY(3/7) • When a new RAN comes into operation, the network manager of this RAN registers to the RADA. • The registered information includes a service URL and a service template. • The service URL contains the IP address, the port number,and the path.

  15. 三、 ACCESS DISCOVERY(4/7) • A service template associated with a RAN could look similar to the following: service: radioaccess: //www.netcom.lab:4050 radioaccess-name = netcomm_lab interface = IEEE 802.11a AP-location = E121.25’48 N31.11’58 Service_Range = 100 m SecurityEn = 802.11i Available_Bandwidth = 30 Mb/s Average_Delay = 20 ms Price = 0.1$/Mb • It is assumed that RAN provides radio access services in a circle where the AP-location is the center and Service_Range is the radius.

  16. 三、 ACCESS DISCOVERY(5/7) • UE initializes a network selection ,it sends an access discovery requirement to the ABC agent. The access discovery requirement includes the RAT interfaces that the UE can support. • ABC obtains the current UE position from the LCS server. Then, the ABC agent sends a service request to the RADA. • A service request might contain the predicate that can look similar to the following: (& (interface = GPRS or IEEE 802.11i) &(UE_ Position = E121.25’43N31.11’52) & (Average_Delay < 50 ms) where GPRS or IEEE 802.11i is the RAT types of UE supported (UE capability). (E121.25’43N31.11’52) is the current position of the UE.

  17. 三、 ACCESS DISCOVERY(6/7) • The RADA finds all the RAN that satisfy the request: • Interfaces that the UE can support • The distance between AP_location and UE_position is smaller than Service_Range • RAN’s Average_Delay is smaller than 50 ms • The ABC agent obtains the QoS information about the RAN available and sends it to the UE. • The UE can make the network selection according to information provided by the ABC agent.

  18. 三、 ACCESS DISCOVERY(7/7)

  19. 四、 PERSONALIZATION INACCESS NETWORK SELECTION(1/2) • ABC means providing the best access network that is best for the user. However, one’s Best generally is not another’s Best. • Therefore, ABC service should be personalized according to each user’s preferences. • There are a several QoS factors that affect access network selection. ex：throughput、reliability、security、cost

  20. 四、 PERSONALIZATION INACCESS NETWORK SELECTION(2/2) • The following is one example: min price s.t. AB＞0.2 Mb/s The example selects the cheapest RAN when available bandwidth is bigger than 0.2 Mb/s.

  21. 五、 SEAMLESS HANDOVER WITH QOS SUPPORT(1/3) • After network selection is completed, the UE should handover from the currently used RAN to the selected RAN. • Note that QoS should be ensured during handover. • The UE performs these actions as follows: • The UE sends a handover notification to the CN. The CN begins to cache packets to send to the UE. • The UE begins to access the selected RAN. • After the UE is registered into the selected RAN, the network manager of the selected RAN sends back the available QoS information to the UE. • The UE sends the binding update (BU) to the home agent (HA) in the home network and to the CN through the access router (AR) in the selected RAN.

  22. 五、 SEAMLESS HANDOVER WITH QOS SUPPORT(2/3) • The AR in the selected RAN performs duplicate address detection (DAD) checks. If the check is successful, the AR sends the binding acknowledgment and available QoS information to the UE. • After the UE receives the binding acknowledgment, it sends the BU and the available QoS information to the CN and the HA. • The CN sends cached packets, and the packets follow up according to the QoS information from the UE. • The UE sends a release notification to the network manager of the currently used RAN. The network manager releases the radio resources allocated to the UE.

  23. 五、 SEAMLESS HANDOVER WITH QOS SUPPORT(3/3)

  24. 六、 CONCLUSION(1/2) • The proposed architecture saves not only the investment in infrastructure but also signaling overhead. • There is not a big change in the infrastructure of the RAN. If only a network manager is added to the RAN and the RAN connects to Internet. The proposed architecture gives network operators an efficient way to integrate their RAN to a 4G system. • The RAN, except for the guidance network, are no longer responsible for the location management of the UE. The RAN need not send QoS information to every UE. The UE can obtain the information by querying from the RADA when the UE must.

  25. 六、 CONCLUSION(2/2) • For users, it provides personalized ABC service and QoS-supported services. • The UE is not required to receive location management signaling of the RAN except for the guidance network. • The UE avoids measuring all signals from all available RAN except the guidance network. • There is only one interface active when the UE is idle. Signaling overhead is saved , and the power to receive and send the signaling overhead is saved. • Through analysis, this architecture demonstrates that it offers benefits not only for network operators ,but also for users.

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